The Valles Marineris, the largest canyon in our solar system, appears as a dark scar across the copper face of Mars. The theory that the gullies in the valley are being morphed by water flow has been recently been disproven by scientists at Johns Hopkins University App...

The idea of liquid water on Mars draws hopes and theories of life and possible habitation on Earth’s closest celestial neighbor. But while water does exist in ice and vapor on Mars, scientists from the Johns Hopkins Universit...